干旱地区农业研究2017，Vol.35Issue(5)：216-222,7.DOI:10.7606/j.issn.1000-7601.2017.05.32
外源水杨酸对盐胁迫下棉花幼苗激素含量及生长特性的影响
Effects of exogenous salicylic acid on hormone contents and growth characteristics of cotton seedlings under salt stress
摘要
Abstract
Zhongmiansuo 41 and Zhongrniansuo 49 were used as the experimental materials,in pot experiment to study the effects of exogenous salicylic acid (SA) on the hormone level and growth characteristics of cotton seedlings under salt stress.The results showed:(1) Under 0.6％ NaCl stress,ABA content of cotton seedling leaves increased,CTK,GA and IAA content decreased,and under the 0.05 mmol· L-1 SA soaking with 0.2 mmol· L-1 spraying treatment,ABA content of Zhongrniansuo 41 and Zhongmiansuo 49 seedlings decreased by 59.14％ and 76.71％ respectively,CTK,GA,IAA content increased by 55.39％,21.05％,22.39％ and 17.08％,12.5％,18.20％ respectively,indicating that SA treatment can effectively alleviate the salt stress injury;(2) Under 0.6％ NaCl stress treatment,ABA/IAA + GA,CTK/IAA and ABA/CTK values increased,decreased and increased again,under the 0.05 mmol·L-1 SA soaking with 0.2 mmol· L-1 spraying treatment,ABA/IAA + GA and ABA/CTK values of Zhongrniansuo 41 and Zhongmiansuo 49 seedlings decreased by 63.40％,74.03％,71.66％ and 79.99％ respectively,CTK/IAA values increased by 28.41％ and 21.18％,indicating that SA can make seedlings restore the dynamic balance of hormones and promote the growth of seedlings;(3) Under 0.6％ NaC1 stress,cotton seedling height,root fresh weight,stem fresh weight and leaf fresh weight decreased,different concentrations of exogenous SA soaking and spraying made them recovered,root performance was the most obvious,the 0.05 mmol·L-1 SA soaking with 0.2 mmol·L-1 spraying treatment under 0.6％ NaC1 stress,the plant fresh weight of the two varieties of cotton seedling were increased by 24.20％ and 22.39％.SA can change regulation of hormone content in cotton seedlings to improve cotton seedling salt tolerance,the alleviation effect of 0.05 mmol· L-1 SA soaking and 0.2 mmol· L-1 spraying treatment on cotton seedlings under salt stress was obvious.关键词
外源水杨酸/棉花幼苗/盐胁迫/激素/生长指标Key words
exogenous salicylic acid/cotton seedling/salt stress/hormone/growth index分类
农业科技引用本文复制引用
李星星,王立红,高丽丽,张巨松..外源水杨酸对盐胁迫下棉花幼苗激素含量及生长特性的影响[J].干旱地区农业研究,2017,35(5):216-222,7.基金项目
国家“十二五”科技支撑项目(2014BAD11B02) （2014BAD11B02）
